<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <form id="form1">
        <input type="text" name="uname" autocomplete="off">
        <input type="password" name="upwd">
        <button type="submit">提交</button>
    </form>

    <script>
        let form = document.querySelector("#form1");
        //组织表单的默认提交行为
        form.addEventListener("submit", function (e) {
            e.preventDefault();

            //将表单数据交给FormData
            let fd = new FormData(form);

            let xhr = new XMLHttpRequest();
            xhr.open("POST", "http://www.liulongbin.top:3006/api/formdata");
            xhr.send(fd);
            xhr.onreadystatechange = function () {
                if (xhr.readyState === 4 && xhr.status === 200) {
                    let result = JSON.parse(xhr.responseText);
                    console.log(result);
                }
            }
        })
    </script>
</body>

</html>